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Taxes - Reconciliation of Swedish Income Tax Rate with Effective Tax Rate (Detail) - SEK (kr) kr in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Reconciliation of accounting profit multiplied by applicable tax rates [abstract] |  |  |
Calculated tax expense at Swedish tax rate of 20.6% | kr (533) | kr 4,804 | kr (5,070)
Effect of foreign tax rates | 430 | (884) | (605)
Current income taxes related to prior years | (162) | 118 | 253
Remeasurement of tax loss carry-forwards | (973) | (28) | (49)
Remeasurement of deductible temporary differences | 308 | 394 | 15
Withholding tax expense | (780) | (217) | 0
Recognition of previously expensed withholding tax | 0 | 0 | 411
Tax effect of non-deductible expenses | (1,045) | (7,311) | (760)
Tax effect of non-taxable income | 655 | 335 | 327
Tax effect of changes in tax rates | (62) | 4 | (19)
Pillar Two tax expense | (53) |  |
Income tax expense | kr (2,215) | kr (2,785) | kr (5,497)
Effective tax rate | 85.60% | (11.90%) | 22.30%

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- Definition Tax effect of income (expense) on assessment of recoverability of deferred tax assets. + References No definition available. + Details
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- Definition Adjustments of tax expense (income) recognised in the period for current tax of prior periods. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 12 -IssueDate 2024-01-01 -Paragraph 80 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2024-en-r&anchor=para_80_b&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The amount that represents the difference between the tax expense (income) and the product of the accounting profit multiplied by the applicable tax rate(s) that relates to changes in the tax rate. [Refer: Accounting profit] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2024-01-01 -Paragraph 81 -Subparagraph c -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2024-en-r&anchor=para_81_c_i&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The amount that represents the difference between the tax expense (income) and the product of the accounting profit multiplied by the applicable tax rate(s) that relates to foreign tax rates. [Refer: Accounting profit] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2024-01-01 -Paragraph 81 -Subparagraph c -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2024-en-r&anchor=para_81_c_i&doctype=Standard -URIDate 2024-03-27 + Details
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